CN100461316C - subminiature switch - Google Patents

Abstract

The invention relates to a sub-miniature switch including a housing, an actuator and terminals. The actuator protrudes from the housing at a position offset from the center of the housing. The terminals are electrically conductively coupled with fixed contacts (positioned within the housing). A contact maker is moved via the actuator and held in a first or second switching position by means of a bistable spring arrangement. An additional component, a separator or auxiliary actuator, is in snap-fit engagement with or clamped or glued in the cover of the housing and is pushed through by the actuator as the switch is operated. According to the present invention, the contact point of the fixed contacts is on a side of the housing which is opposite the actuator. The separator or auxiliary actuator is moved in the direction of the contact position by the actuator. Thus a structurally simple forced-opening capability is provided for the sub-miniature switch.

Description

subminiature switch

technical field

The invention relates to an ultra-small switch.

Background technique

A prior art microswitch is disclosed in EP618603B1 and GB2142471A, wherein the microswitch has a housing with a cover, an operating element protruding from the housing and external connection contacts. The operating part is arranged at a position deviated from the middle of the casing. The connection contacts are electrically conductively connected to fixed contacts located inside the housing. A movably arranged, in particular rotatably arranged, contactor can assume two positions depending on the actuating position. In the first and second switching position the contactor is each held by a bistable spring arrangement (tension spring).

An additional component, a pressure device or a separator or an auxiliary operating element, is arranged in the housing, said additional component being pressed by the operating element when switching from the first switching position to the second switching position. The auxiliary operating element is arranged on the operating element according to the prior art.

Such subminiature switches are used in industrial applications in tube motors of rotary charging drives or sunshade drives in order to respond to the end position of the rotary charging. High demands are placed on the operational safety and lifetime of such subminiature switches. Capacitive loading of the contacts at the terminal position will easily lead to sticking or welding of the contacts. The standard contact breaking force produced by the tension spring of the bistable spring arrangement is no longer sufficient to break the stuck contacts. This would result in damage to the disconnected drive. In order to avoid the occurrence of this point, it must be ensured that the contact to be disconnected can still be disconnected despite the phenomenon of contact adhesion after the operating member moves a certain stroke.

Additional separators are known for this purpose. However, due to the provision of such additional components, both production and installation are expensive.

Contents of the invention

The object of the present invention is to propose an ultra-miniature switch which has a structurally simple and reliable positive opening function without changing the structural dimensions.

The technical scheme that realizes the object of the present invention is:

A subminiature switch,

has a shell;

An operating member is provided, and the operating member protrudes from the housing at a middle position deviated from the housing;

having connection contacts which are electrically conductively connected to fixed contacts located in the housing;

wherein the fixed contact is arranged on the side of the housing opposite to the offset operating element,

and a contactor having a movement arrangement, said contactor being held in a first or second switching position depending on the switching position of the operating member;

and have a separator or auxiliary operating member;

Wherein the separator or the auxiliary operation part is fixed in the cover of the housing and

The separator or the auxiliary operating member is operated to move toward the contact position between the fixed contact and the contactor through the movement of the operating member toward the separator fixed in the cover.

According to a further development of the invention, the movable end of the separator or of the auxiliary actuating element has a transverse arm which acts in a range beside the contact position in order to mechanically assist breaking the contact.

According to a further development of the invention, the separator or the auxiliary operating element is snapped onto the cover.

According to a further design of the present invention, the separator or the auxiliary operating member is clamped or glued on the cover.

The technical solution of the present invention is characterized in that the separator or the auxiliary operating member is fixed on the cover plate of the casing and the separator or the auxiliary operating member is accurately moved to the contact position by the operating member. Usually the separator is snapped together with the cover of the case. However, the separator can also be clipped or glued to the cover. The structure of the cover plate should be such that it can absorb the deflection of the separator. Between the pivoting position of the cover plate and the active position of the operating element, a transverse arm is arranged at the level of the contacts. When the separator is pressed down against the contactor by the operating part, the cross-arm of the separator will tear away the possible welding of the so-called NC contacts.

This solution is simpler than that of the prior art and can lead to a positive disconnection in the event of so-called NC contact welding. Where the separator is in direct contact with the contactor and the weld is torn apart by adding a force parallel to the direction of movement.

Description of drawings

The embodiments will be further described below. The figure shows:

Figure 1 is a view of an ultra-miniature switch with a separator and an operating member;

Fig. 2 is a sectional view of the micro switch, wherein the operating member is in the initial position;

Figure 3 A view of a microswitch with the contacts welded together, the separator acting on the contactor, and

Figure 4 is a cross-sectional view of the microswitch with the operating member in the end position.

Detailed ways

The subminiature switch 1 is shown in perspective view in FIG. 1 , in which the upper operating element 7 and the lower lugs or connection contacts 9 , 11 and 13 can be seen. The structure is supported on a seat 3 of a housing, out of which the connection contacts 9, 11 and 13 protrude downwards. Only one half of the housing is shown in the figure.

In this configuration of the microswitch, the actuating element is not arranged centrally, but is, for example, offset to the right. The operating member 7 pushes via a tension spring 19 against a contactor 15 which is movably (for example rotatably) arranged and has two contacts at its movable end. The blades of the contactor 15 are electrically conductively connected to the common connecting contact 9 via a contact bearing (not shown in the figure). Contact 17 forms a contact point with fixed contacts 24 and 27 . The upper fixed contact 24 is electrically conductively connected to the connecting contact 11 via a connecting wire 25 , and the lower fixed contact 27 is correspondingly connected to the connecting contact 13 .

As shown in the sectional view of FIG. 2 , the operating member 7 is in the initial position. The tension spring 19 and the contactor 15 are designed as a bistable spring device and the contactor 15 is first fixed in the upper contact position (the initial position of the operating part 7 shown in FIG. 2 ) and then the contactor 15 is fixed in the In the lower contact position shown in FIG. 4 (the end position of the operating member 7).

As mentioned above, the contactor 15 is easily welded or glued to the fixed contact 24 in the contact position shown in FIG. 2 . The connecting contact 11 (NC contact) can be mechanically assisted by an additional component, ie a separator or an auxiliary actuating element 21 when breaking the contact. During operation, the operating member 7 also moves toward the auxiliary operating member 21 . The separator 21 then pushes the contactor 15 via the transverse arm 23 in the area of the fixed contacts 24 , 27 in order to mechanically tear the contactor apart. As shown in FIG. 1 , the auxiliary operating member 21 is fixed on the left side of the housing cover 5 . The right side of the separator 21 is movable and the mechanical breaking of the contacts is assisted by means of a cross arm 23 .

FIG. 3 shows an intermediate state in which the actuating element 7 has not yet fully reached the end position shown in FIG. 4 . Certainly at this moment extension spring 9 has attempted contact disconnection. The phase shown in FIG. 3 is the phase in which the cross-arm assistance of the separator 21 is applied.

Comparison table of reference signs

1 subminiature switch or micro switch

2 shell seat

5 Housing cover

7 Operating parts

9 common connection contact (COM)

11 Connection contact NC

13 Connection contact NO

15 Contactors for mobile settings

17 Contact of contactor 15

19 Extension spring of bistable spring device

21 Separator or auxiliary operating parts

23 The cross arm of the separator 21

24 Fixed contact connecting contact 11

25 The connection line connecting contact 11 and fixed contact 24

27 Fixed contact connecting contact 13

Claims (4)

1. An ultra-small switch (1), has shell(3,5); There is an operating member (7), which protrudes from the housing at a middle position deviated from the housing (3, 5); having two connection contacts (11, 13) which are electrically conductively connected to fixed contacts (24, 27) located in the casing (3, 5); Wherein the fixed contacts (24, 27) are arranged on the side of the housing (3, 5) opposite to the operating part (7) arranged offset, and having a movably arranged contactor (15), said contactor being held in the first or second switch position according to the switch position of the operating member (7) by means of a bistable spring device (19); and having a movable separator or auxiliary operating member (21) capable of making contact with said contactor (15); It is characterized in that, The separator or the auxiliary operating part (21) is fixed in the cover (5) of the housing (3, 5) and By moving the operating part (7) to the direction of the separator or auxiliary operating part (21) fixed in the cover (5), the separator or auxiliary operating part (21) is moved toward the fixed contact (24) by the operated part (7). , 27) move in the direction of the contact position (17) with the contactor (15). 2. Subminiature switch (1) according to claim 1, characterized in that the movable end of the separator or the auxiliary operating member (21) has a cross arm (23), which acts on the side of the contact position. within a range for mechanical assistance in breaking contacts. 3. Subminiature switch (1) according to claim 1 or 2, characterized in that the separator or the auxiliary operating element (21) is locked on the cover (5). 4. The subminiature switch (1) according to claim 1 or 2, characterized in that the separator or the auxiliary operating member (21) is clamped or glued on the cover (5).

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